/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "bus-util.h" #include "cap-list.h" #include "cpu-set-util.h" #include "device-util.h" #include "devnum-util.h" #include "env-util.h" #include "format-util.h" #include "fs-util.h" #include "hostname-util.h" #include "json.h" #include "missing_sched.h" #include "nspawn-oci.h" #include "path-util.h" #include "rlimit-util.h" #include "seccomp-util.h" #include "stdio-util.h" #include "string-util.h" #include "strv.h" #include "user-util.h" /* TODO: * OCI runtime tool implementation * hooks * * Spec issues: * * How is RLIM_INFINITY supposed to be encoded? * configured effective caps is bullshit, as execv() corrupts it anyway * pipes bind mounted is *very* different from pipes newly created, comments regarding bind mount or not are bogus * annotation values structured? or string? * configurable file system namespace path, but then also root path? wtf? * apply sysctl inside of the container? or outside? * how is unlimited pids tasks limit to be encoded? * what are the defaults for caps if not specified? * what are the default uid/gid mappings if one is missing but the other set, or when user ns is on but no namespace configured * the source field of "mounts" is really weird, as it cannot realistically be relative to the bundle, since we never know if that's what the fs wants * spec contradicts itself on the mount "type" field, as the example uses "bind" as type, but it's not listed in /proc/filesystem, and is something made up by /bin/mount * if type of mount is left out, what shall be assumed? "bind"? * readonly mounts is entirely redundant? * should escaping be applied when joining mount options with ","? * devices cgroup support is bogus, "allow" and "deny" on the kernel level is about adding/removing entries, not about access * spec needs to say that "rwm" devices cgroup combination can't be the empty string * cgrouspv1 crap: kernel, kernelTCP, swappiness, disableOOMKiller, swap, devices, leafWeight * general: it shouldn't leak lower level abstractions this obviously * unmanagable cgroups stuff: realtimeRuntime/realtimePeriod * needs to say what happense when some option is not specified, i.e. which defaults apply * no architecture? no personality? * seccomp example and logic is simply broken: there's no constant "SCMP_ACT_ERRNO". * spec should say what to do with unknown props * /bin/mount regarding NFS and FUSE required? * what does terminal=false mean? * sysctl inside or outside? allow-listing? * swapiness typo -> swappiness * * Unsupported: * * apparmorProfile * selinuxLabel + mountLabel * hugepageLimits * network * rdma * intelRdt * swappiness, disableOOMKiller, kernel, kernelTCP, leafWeight (because it's dead, cgroupsv2 can't do it and hence systemd neither) * * Non-slice cgroup paths * Propagation that is not slave + shared * more than one uid/gid mapping, mappings with a container base != 0, or non-matching uid/gid mappings * device cgroups access = false items that are not catchall * device cgroups matches where minor is specified, but major isn't. similar where major is specified but char/block is not. also, any match that only has a type set that has less than "rwm" set. also, any entry that has none of rwm set. * */ static int oci_unexpected(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Unexpected OCI element '%s' of type '%s'.", name, json_variant_type_to_string(json_variant_type(v))); } static int oci_dispatch(JsonVariant *v, const JsonDispatch table[], JsonDispatchFlags flags, void *userdata) { return json_dispatch_full(v, table, oci_unexpected, flags, userdata, /* reterr_bad_field= */ NULL); } static int oci_unsupported(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Unsupported OCI element '%s' of type '%s'.", name, json_variant_type_to_string(json_variant_type(v))); } static int oci_terminal(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); /* If not specified, or set to true, we'll default to either an interactive or a read-only * console. If specified as false, we'll forcibly move to "pipe" mode though. */ s->console_mode = json_variant_boolean(v) ? _CONSOLE_MODE_INVALID : CONSOLE_PIPE; return 0; } static int oci_console_dimension(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) { unsigned *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(variant); if (k == 0) return json_log(variant, flags, SYNTHETIC_ERRNO(ERANGE), "Console size field '%s' is too small.", strna(name)); if (k > USHRT_MAX) /* TIOCSWINSZ's struct winsize uses "unsigned short" for width and height */ return json_log(variant, flags, SYNTHETIC_ERRNO(ERANGE), "Console size field '%s' is too large.", strna(name)); *u = (unsigned) k; return 0; } static int oci_console_size(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); static const JsonDispatch table[] = { { "height", JSON_VARIANT_UNSIGNED, oci_console_dimension, offsetof(Settings, console_height), JSON_MANDATORY }, { "width", JSON_VARIANT_UNSIGNED, oci_console_dimension, offsetof(Settings, console_width), JSON_MANDATORY }, {} }; return oci_dispatch(v, table, flags, s); } static int oci_absolute_path(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { char **p = ASSERT_PTR(userdata); const char *n; n = json_variant_string(v); if (!path_is_absolute(n)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Path in JSON field '%s' is not absolute: %s", strna(name), n); return free_and_strdup_warn(p, n); } static int oci_env(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { char ***l = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { const char *n; if (!json_variant_is_string(e)) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Environment array contains non-string."); assert_se(n = json_variant_string(e)); if (!env_assignment_is_valid(n)) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Environment assignment not valid: %s", n); r = strv_extend(l, n); if (r < 0) return log_oom(); } return 0; } static int oci_args(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { _cleanup_strv_free_ char **l = NULL; char ***value = ASSERT_PTR(userdata); int r; r = json_variant_strv(v, &l); if (r < 0) return json_log(v, flags, r, "Cannot parse arguments as list of strings: %m"); if (strv_isempty(l)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Argument list empty, refusing."); if (isempty(l[0])) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Executable name is empty, refusing."); return strv_free_and_replace(*value, l); } static int oci_rlimit_type(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { const char *z; int *type = ASSERT_PTR(userdata); int t; z = startswith(json_variant_string(v), "RLIMIT_"); if (!z) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "rlimit entry's name does not begin with 'RLIMIT_', refusing: %s", json_variant_string(v)); t = rlimit_from_string(z); if (t < 0) return json_log(v, flags, t, "rlimit name unknown: %s", json_variant_string(v)); *type = t; return 0; } static int oci_rlimit_value(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { rlim_t *value = ASSERT_PTR(userdata); rlim_t z; if (json_variant_is_negative(v)) z = RLIM_INFINITY; else { if (!json_variant_is_unsigned(v)) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "rlimits limit not unsigned, refusing."); z = (rlim_t) json_variant_unsigned(v); if ((uint64_t) z != json_variant_unsigned(v)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "rlimits limit out of range, refusing."); } *value = z; return 0; } static int oci_rlimits(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { struct rlimit_data { int type; rlim_t soft; rlim_t hard; } data = { .type = -1, .soft = RLIM_INFINITY, .hard = RLIM_INFINITY, }; static const JsonDispatch table[] = { { "soft", JSON_VARIANT_NUMBER, oci_rlimit_value, offsetof(struct rlimit_data, soft), JSON_MANDATORY }, { "hard", JSON_VARIANT_NUMBER, oci_rlimit_value, offsetof(struct rlimit_data, hard), JSON_MANDATORY }, { "type", JSON_VARIANT_STRING, oci_rlimit_type, offsetof(struct rlimit_data, type), JSON_MANDATORY }, {} }; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; assert(data.type >= 0); assert(data.type < _RLIMIT_MAX); if (s->rlimit[data.type]) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "rlimits array contains duplicate entry, refusing."); s->rlimit[data.type] = new(struct rlimit, 1); if (!s->rlimit[data.type]) return log_oom(); *s->rlimit[data.type] = (struct rlimit) { .rlim_cur = data.soft, .rlim_max = data.hard, }; } return 0; } static int oci_capability_array(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uint64_t *mask = ASSERT_PTR(userdata); uint64_t m = 0; JsonVariant *e; JSON_VARIANT_ARRAY_FOREACH(e, v) { const char *n; int cap; if (!json_variant_is_string(e)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Entry in capabilities array is not a string."); assert_se(n = json_variant_string(e)); cap = capability_from_name(n); if (cap < 0) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Unknown capability: %s", n); m |= UINT64_C(1) << cap; } if (*mask == UINT64_MAX) *mask = m; else *mask |= m; return 0; } static int oci_capabilities(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "effective", JSON_VARIANT_ARRAY, oci_capability_array, offsetof(CapabilityQuintet, effective) }, { "bounding", JSON_VARIANT_ARRAY, oci_capability_array, offsetof(CapabilityQuintet, bounding) }, { "inheritable", JSON_VARIANT_ARRAY, oci_capability_array, offsetof(CapabilityQuintet, inheritable) }, { "permitted", JSON_VARIANT_ARRAY, oci_capability_array, offsetof(CapabilityQuintet, permitted) }, { "ambient", JSON_VARIANT_ARRAY, oci_capability_array, offsetof(CapabilityQuintet, ambient) }, {} }; Settings *s = ASSERT_PTR(userdata); int r; r = oci_dispatch(v, table, flags, &s->full_capabilities); if (r < 0) return r; if (s->full_capabilities.bounding != UINT64_MAX) { s->capability = s->full_capabilities.bounding; s->drop_capability = ~s->full_capabilities.bounding; } return 0; } static int oci_oom_score_adj(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); int64_t k; k = json_variant_integer(v); if (k < OOM_SCORE_ADJ_MIN || k > OOM_SCORE_ADJ_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "oomScoreAdj value out of range: %" PRIi64, k); s->oom_score_adjust = (int) k; s->oom_score_adjust_set = true; return 0; } static int oci_uid_gid(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uid_t *uid = ASSERT_PTR(userdata); uid_t u; uint64_t k; assert_cc(sizeof(uid_t) == sizeof(gid_t)); k = json_variant_unsigned(v); u = (uid_t) k; if ((uint64_t) u != k) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "UID/GID out of range: %" PRIu64, k); if (!uid_is_valid(u)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "UID/GID is not valid: " UID_FMT, u); *uid = u; return 0; } static int oci_supplementary_gids(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { gid_t gid, *a; if (!json_variant_is_unsigned(e)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Supplementary GID entry is not a UID."); r = oci_uid_gid(name, e, flags, &gid); if (r < 0) return r; a = reallocarray(s->supplementary_gids, s->n_supplementary_gids + 1, sizeof(gid_t)); if (!a) return log_oom(); s->supplementary_gids = a; s->supplementary_gids[s->n_supplementary_gids++] = gid; } return 0; } static int oci_user(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "uid", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(Settings, uid), JSON_MANDATORY }, { "gid", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(Settings, gid), JSON_MANDATORY }, { "additionalGids", JSON_VARIANT_ARRAY, oci_supplementary_gids, 0, 0 }, {} }; return oci_dispatch(v, table, flags, userdata); } static int oci_process(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "terminal", JSON_VARIANT_BOOLEAN, oci_terminal, 0, 0 }, { "consoleSize", JSON_VARIANT_OBJECT, oci_console_size, 0, 0 }, { "cwd", JSON_VARIANT_STRING, oci_absolute_path, offsetof(Settings, working_directory), 0 }, { "env", JSON_VARIANT_ARRAY, oci_env, offsetof(Settings, environment), 0 }, { "args", JSON_VARIANT_ARRAY, oci_args, offsetof(Settings, parameters), 0 }, { "rlimits", JSON_VARIANT_ARRAY, oci_rlimits, 0, 0 }, { "apparmorProfile", JSON_VARIANT_STRING, oci_unsupported, 0, JSON_PERMISSIVE }, { "capabilities", JSON_VARIANT_OBJECT, oci_capabilities, 0, 0 }, { "noNewPrivileges", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, offsetof(Settings, no_new_privileges), 0 }, { "oomScoreAdj", JSON_VARIANT_INTEGER, oci_oom_score_adj, 0, 0 }, { "selinuxLabel", JSON_VARIANT_STRING, oci_unsupported, 0, JSON_PERMISSIVE }, { "user", JSON_VARIANT_OBJECT, oci_user, 0, 0 }, {} }; return oci_dispatch(v, table, flags, userdata); } static int oci_root(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); int r; static const JsonDispatch table[] = { { "path", JSON_VARIANT_STRING, json_dispatch_string, offsetof(Settings, root) }, { "readonly", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, offsetof(Settings, read_only) }, {} }; r = oci_dispatch(v, table, flags, s); if (r < 0) return r; if (s->root && !path_is_absolute(s->root)) { char *joined; joined = path_join(s->bundle, s->root); if (!joined) return log_oom(); free_and_replace(s->root, joined); } return 0; } static int oci_hostname(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); const char *n; assert_se(n = json_variant_string(v)); if (!hostname_is_valid(n, 0)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Hostname string is not a valid hostname: %s", n); return free_and_strdup_warn(&s->hostname, n); } static bool oci_exclude_mount(const char *path) { /* Returns "true" for all mounts we insist to mount on our own, and hence ignore the OCI data. */ if (PATH_IN_SET(path, "/dev", "/dev/mqueue", "/dev/pts", "/dev/shm", "/proc", "/proc/acpi", "/proc/apm", "/proc/asound", "/proc/bus", "/proc/fs", "/proc/irq", "/proc/kallsyms", "/proc/kcore", "/proc/keys", "/proc/scsi", "/proc/sys", "/proc/sys/net", "/proc/sysrq-trigger", "/proc/timer_list", "/run", "/sys", "/sys", "/sys/fs/selinux", "/tmp")) return true; /* Similar, skip the whole /sys/fs/cgroups subtree */ if (path_startswith(path, "/sys/fs/cgroup")) return true; return false; } typedef struct oci_mount_data { char *destination; char *source; char *type; char **options; } oci_mount_data; static void oci_mount_data_done(oci_mount_data *data) { assert(data); free(data->destination); free(data->source); free(data->type); strv_free(data->options); } static int oci_mounts(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { static const JsonDispatch table[] = { { "destination", JSON_VARIANT_STRING, oci_absolute_path, offsetof(oci_mount_data, destination), JSON_MANDATORY }, { "source", JSON_VARIANT_STRING, json_dispatch_string, offsetof(oci_mount_data, source), 0 }, { "options", JSON_VARIANT_ARRAY, json_dispatch_strv, offsetof(oci_mount_data, options), 0, }, { "type", JSON_VARIANT_STRING, json_dispatch_string, offsetof(oci_mount_data, type), 0 }, {} }; _cleanup_free_ char *joined_options = NULL; _cleanup_(oci_mount_data_done) oci_mount_data data = {}; CustomMount *m; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (!path_is_absolute(data.destination)) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Mount destination not an absolute path: %s", data.destination); if (oci_exclude_mount(data.destination)) continue; if (data.options) { joined_options = strv_join(data.options, ","); if (!joined_options) return log_oom(); } if (!data.type || streq(data.type, "bind")) { if (data.source && !path_is_absolute(data.source)) { char *joined; joined = path_join(s->bundle, data.source); if (!joined) return log_oom(); free_and_replace(data.source, joined); } data.type = mfree(data.type); m = custom_mount_add(&s->custom_mounts, &s->n_custom_mounts, CUSTOM_MOUNT_BIND); } else m = custom_mount_add(&s->custom_mounts, &s->n_custom_mounts, CUSTOM_MOUNT_ARBITRARY); if (!m) return log_oom(); m->destination = TAKE_PTR(data.destination); m->source = TAKE_PTR(data.source); m->options = TAKE_PTR(joined_options); m->type_argument = TAKE_PTR(data.type); } return 0; } static int oci_namespace_type(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { unsigned long *nsflags = ASSERT_PTR(userdata); const char *n; assert_se(n = json_variant_string(v)); /* We don't use namespace_flags_from_string() here, as the OCI spec uses slightly different names than the * kernel here. */ if (streq(n, "pid")) *nsflags = CLONE_NEWPID; else if (streq(n, "network")) *nsflags = CLONE_NEWNET; else if (streq(n, "mount")) *nsflags = CLONE_NEWNS; else if (streq(n, "ipc")) *nsflags = CLONE_NEWIPC; else if (streq(n, "uts")) *nsflags = CLONE_NEWUTS; else if (streq(n, "user")) *nsflags = CLONE_NEWUSER; else if (streq(n, "cgroup")) *nsflags = CLONE_NEWCGROUP; else return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Unknown namespace type, refusing: %s", n); return 0; } struct namespace_data { unsigned long type; char *path; }; static void namespace_data_done(struct namespace_data *data) { assert(data); free(data->path); } static int oci_namespaces(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); unsigned long n = 0; JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { _cleanup_(namespace_data_done) struct namespace_data data = {}; static const JsonDispatch table[] = { { "type", JSON_VARIANT_STRING, oci_namespace_type, offsetof(struct namespace_data, type), JSON_MANDATORY }, { "path", JSON_VARIANT_STRING, oci_absolute_path, offsetof(struct namespace_data, path), 0 }, {} }; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (data.path) { if (data.type != CLONE_NEWNET) return json_log(e, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Specifying namespace path for non-network namespace is not supported."); if (s->network_namespace_path) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Network namespace path specified more than once, refusing."); free_and_replace(s->network_namespace_path, data.path); } if (FLAGS_SET(n, data.type)) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Duplicate namespace specification, refusing."); n |= data.type; } if (!FLAGS_SET(n, CLONE_NEWNS)) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Containers without a mount namespace aren't supported."); s->private_network = FLAGS_SET(n, CLONE_NEWNET); s->userns_mode = FLAGS_SET(n, CLONE_NEWUSER) ? USER_NAMESPACE_FIXED : USER_NAMESPACE_NO; s->use_cgns = FLAGS_SET(n, CLONE_NEWCGROUP); s->clone_ns_flags = n & (CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS); return 0; } static int oci_uid_gid_range(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uid_t *uid = ASSERT_PTR(userdata); uid_t u; uint64_t k; assert_cc(sizeof(uid_t) == sizeof(gid_t)); /* This is very much like oci_uid_gid(), except the checks are a bit different, as this is a UID range rather * than a specific UID, and hence UID_INVALID has no special significance. OTOH a range of zero makes no * sense. */ k = json_variant_unsigned(v); u = (uid_t) k; if ((uint64_t) u != k) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "UID/GID out of range: %" PRIu64, k); if (u == 0) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "UID/GID range can't be zero."); *uid = u; return 0; } static int oci_uid_gid_mappings(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { struct mapping_data { uid_t host_id; uid_t container_id; uid_t range; } data = { .host_id = UID_INVALID, .container_id = UID_INVALID, .range = 0, }; static const JsonDispatch table[] = { { "containerID", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(struct mapping_data, container_id), JSON_MANDATORY }, { "hostID", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(struct mapping_data, host_id), JSON_MANDATORY }, { "size", JSON_VARIANT_UNSIGNED, oci_uid_gid_range, offsetof(struct mapping_data, range), JSON_MANDATORY }, {} }; Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; if (json_variant_elements(v) == 0) return 0; if (json_variant_elements(v) > 1) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "UID/GID mappings with more than one entry are not supported."); assert_se(e = json_variant_by_index(v, 0)); r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (data.host_id + data.range < data.host_id || data.container_id + data.range < data.container_id) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "UID/GID range goes beyond UID/GID validity range, refusing."); if (data.container_id != 0) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "UID/GID mappings with a non-zero container base are not supported."); if (data.range < 0x10000) json_log(v, flags|JSON_WARNING, 0, "UID/GID mapping with less than 65536 UID/GIDS set up, you are looking for trouble."); if (s->uid_range != UID_INVALID && (s->uid_shift != data.host_id || s->uid_range != data.range)) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Non-matching UID and GID mappings are not supported."); s->uid_shift = data.host_id; s->uid_range = data.range; return 0; } static int oci_device_type(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { mode_t *mode = ASSERT_PTR(userdata); const char *t; assert_se(t = json_variant_string(v)); if (STR_IN_SET(t, "c", "u")) *mode = (*mode & ~S_IFMT) | S_IFCHR; else if (streq(t, "b")) *mode = (*mode & ~S_IFMT) | S_IFBLK; else if (streq(t, "p")) *mode = (*mode & ~S_IFMT) | S_IFIFO; else return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Unknown device type: %s", t); return 0; } static int oci_device_major(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { unsigned *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(v); if (!DEVICE_MAJOR_VALID(k)) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Device major %" PRIu64 " out of range.", k); *u = (unsigned) k; return 0; } static int oci_device_minor(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { unsigned *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(v); if (!DEVICE_MINOR_VALID(k)) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Device minor %" PRIu64 " out of range.", k); *u = (unsigned) k; return 0; } static int oci_device_file_mode(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { mode_t *mode = ASSERT_PTR(userdata); mode_t m; uint64_t k; k = json_variant_unsigned(v); m = (mode_t) k; if ((m & ~07777) != 0 || (uint64_t) m != k) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "fileMode out of range, refusing."); *mode = (*mode & ~07777) | m; return 0; } static int oci_devices(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { static const JsonDispatch table[] = { { "type", JSON_VARIANT_STRING, oci_device_type, offsetof(DeviceNode, mode), JSON_MANDATORY }, { "path", JSON_VARIANT_STRING, oci_absolute_path, offsetof(DeviceNode, path), JSON_MANDATORY }, { "major", JSON_VARIANT_UNSIGNED, oci_device_major, offsetof(DeviceNode, major), 0 }, { "minor", JSON_VARIANT_UNSIGNED, oci_device_minor, offsetof(DeviceNode, minor), 0 }, { "fileMode", JSON_VARIANT_UNSIGNED, oci_device_file_mode, offsetof(DeviceNode, mode), 0 }, { "uid", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(DeviceNode, uid), 0 }, { "gid", JSON_VARIANT_UNSIGNED, oci_uid_gid, offsetof(DeviceNode, gid), 0 }, {} }; DeviceNode *node, *nodes; nodes = reallocarray(s->extra_nodes, s->n_extra_nodes + 1, sizeof(DeviceNode)); if (!nodes) return log_oom(); s->extra_nodes = nodes; node = nodes + s->n_extra_nodes; *node = (DeviceNode) { .uid = UID_INVALID, .gid = GID_INVALID, .major = UINT_MAX, .minor = UINT_MAX, .mode = 0644, }; r = oci_dispatch(e, table, flags, node); if (r < 0) goto fail_element; if (S_ISCHR(node->mode) || S_ISBLK(node->mode)) { _cleanup_free_ char *path = NULL; if (node->major == UINT_MAX || node->minor == UINT_MAX) { r = json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Major/minor required when device node is device node"); goto fail_element; } /* Suppress a couple of implicit device nodes */ r = devname_from_devnum(node->mode, makedev(node->major, node->minor), &path); if (r < 0) json_log(e, flags|JSON_DEBUG, r, "Failed to resolve device node %u:%u, ignoring: %m", node->major, node->minor); else { if (PATH_IN_SET(path, "/dev/null", "/dev/zero", "/dev/full", "/dev/random", "/dev/urandom", "/dev/tty", "/dev/net/tun", "/dev/ptmx", "/dev/pts/ptmx", "/dev/console")) { json_log(e, flags|JSON_DEBUG, 0, "Ignoring devices item for device '%s', as it is implicitly created anyway.", path); free(node->path); continue; } } } s->n_extra_nodes++; continue; fail_element: free(node->path); return r; } return 0; } static int oci_cgroups_path(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { _cleanup_free_ char *slice = NULL, *backwards = NULL; Settings *s = ASSERT_PTR(userdata); const char *p; int r; assert_se(p = json_variant_string(v)); r = cg_path_get_slice(p, &slice); if (r < 0) return json_log(v, flags, r, "Couldn't derive slice unit name from path '%s': %m", p); r = cg_slice_to_path(slice, &backwards); if (r < 0) return json_log(v, flags, r, "Couldn't convert slice unit name '%s' back to path: %m", slice); if (!path_equal(backwards, p)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Control group path '%s' does not refer to slice unit, refusing.", p); free_and_replace(s->slice, slice); return 0; } static int oci_cgroup_device_type(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { mode_t *mode = ASSERT_PTR(userdata); const char *n; assert_se(n = json_variant_string(v)); if (streq(n, "c")) *mode = S_IFCHR; else if (streq(n, "b")) *mode = S_IFBLK; else return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Control group device type unknown: %s", n); return 0; } struct device_data { bool allow; bool r; bool w; bool m; mode_t type; unsigned major; unsigned minor; }; static int oci_cgroup_device_access(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { struct device_data *d = ASSERT_PTR(userdata); bool r = false, w = false, m = false; const char *s; size_t i; assert_se(s = json_variant_string(v)); for (i = 0; s[i]; i++) if (s[i] == 'r') r = true; else if (s[i] == 'w') w = true; else if (s[i] == 'm') m = true; else return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Unknown device access character '%c'.", s[i]); d->r = r; d->w = w; d->m = m; return 0; } static int oci_cgroup_devices(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { _cleanup_free_ struct device_data *list = NULL; Settings *s = ASSERT_PTR(userdata); size_t n_list = 0, i; bool noop = false; JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { struct device_data data = { .major = UINT_MAX, .minor = UINT_MAX, }, *a; static const JsonDispatch table[] = { { "allow", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, offsetof(struct device_data, allow), JSON_MANDATORY }, { "type", JSON_VARIANT_STRING, oci_cgroup_device_type, offsetof(struct device_data, type), 0 }, { "major", JSON_VARIANT_UNSIGNED, oci_device_major, offsetof(struct device_data, major), 0 }, { "minor", JSON_VARIANT_UNSIGNED, oci_device_minor, offsetof(struct device_data, minor), 0 }, { "access", JSON_VARIANT_STRING, oci_cgroup_device_access, 0, 0 }, {} }; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (!data.allow) { /* The fact that OCI allows 'deny' entries makes really no sense, as 'allow' * vs. 'deny' for the devices cgroup controller is really not about allow-listing and * deny-listing but about adding and removing entries from the allow list. Since we * always start out with an empty allow list we hence ignore the whole thing, as * removing entries which don't exist make no sense. We'll log about this, since this * is really borked in the spec, with one exception: the entry that's supposed to * drop the kernel's default we ignore silently */ if (!data.r || !data.w || !data.m || data.type != 0 || data.major != UINT_MAX || data.minor != UINT_MAX) json_log(v, flags|JSON_WARNING, 0, "Devices cgroup allow list with arbitrary 'allow' entries not supported, ignoring."); /* We ignore the 'deny' entry as for us that's implied */ continue; } if (!data.r && !data.w && !data.m) { json_log(v, flags|LOG_WARNING, 0, "Device cgroup allow list entry with no effect found, ignoring."); continue; } if (data.minor != UINT_MAX && data.major == UINT_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Device cgroup allow list entries with minors but no majors not supported."); if (data.major != UINT_MAX && data.type == 0) return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Device cgroup allow list entries with majors but no device node type not supported."); if (data.type == 0) { if (data.r && data.w && data.m) /* a catchall allow list entry means we are looking at a noop */ noop = true; else return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "Device cgroup allow list entries with no type not supported."); } a = reallocarray(list, n_list + 1, sizeof(struct device_data)); if (!a) return log_oom(); list = a; list[n_list++] = data; } if (noop) return 0; r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_open_container(s->properties, 'r', "sv"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_append(s->properties, "s", "DeviceAllow"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(s->properties, 'v', "a(ss)"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(s->properties, 'a', "(ss)"); if (r < 0) return bus_log_create_error(r); for (i = 0; i < n_list; i++) { _cleanup_free_ char *pattern = NULL; char access[4]; size_t n = 0; if (list[i].minor == UINT_MAX) { const char *t; if (list[i].type == S_IFBLK) t = "block"; else { assert(list[i].type == S_IFCHR); t = "char"; } if (list[i].major == UINT_MAX) { pattern = strjoin(t, "-*"); if (!pattern) return log_oom(); } else { if (asprintf(&pattern, "%s-%u", t, list[i].major) < 0) return log_oom(); } } else { assert(list[i].major != UINT_MAX); /* If a minor is specified, then a major also needs to be specified */ r = device_path_make_major_minor(list[i].type, makedev(list[i].major, list[i].minor), &pattern); if (r < 0) return log_oom(); } if (list[i].r) access[n++] = 'r'; if (list[i].w) access[n++] = 'w'; if (list[i].m) access[n++] = 'm'; access[n] = 0; assert(n > 0); r = sd_bus_message_append(s->properties, "(ss)", pattern, access); if (r < 0) return bus_log_create_error(r); } r = sd_bus_message_close_container(s->properties); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(s->properties); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(s->properties); if (r < 0) return bus_log_create_error(r); return 0; } static int oci_cgroup_memory_limit(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uint64_t *m = ASSERT_PTR(userdata); uint64_t k; if (json_variant_is_negative(v)) { *m = UINT64_MAX; return 0; } if (!json_variant_is_unsigned(v)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Memory limit is not an unsigned integer"); k = json_variant_unsigned(v); if (k >= UINT64_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Memory limit too large: %" PRIu64, k); *m = (uint64_t) k; return 0; } static int oci_cgroup_memory(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { struct memory_data { uint64_t limit; uint64_t reservation; uint64_t swap; } data = { .limit = UINT64_MAX, .reservation = UINT64_MAX, .swap = UINT64_MAX, }; static const JsonDispatch table[] = { { "limit", JSON_VARIANT_NUMBER, oci_cgroup_memory_limit, offsetof(struct memory_data, limit), 0 }, { "reservation", JSON_VARIANT_NUMBER, oci_cgroup_memory_limit, offsetof(struct memory_data, reservation), 0 }, { "swap", JSON_VARIANT_NUMBER, oci_cgroup_memory_limit, offsetof(struct memory_data, swap), 0 }, { "kernel", JSON_VARIANT_NUMBER, oci_unsupported, 0, JSON_PERMISSIVE }, { "kernelTCP", JSON_VARIANT_NUMBER, oci_unsupported, 0, JSON_PERMISSIVE }, { "swapiness", JSON_VARIANT_NUMBER, oci_unsupported, 0, JSON_PERMISSIVE }, { "disableOOMKiller", JSON_VARIANT_BOOLEAN, oci_unsupported, 0, JSON_PERMISSIVE }, {} }; Settings *s = ASSERT_PTR(userdata); int r; r = oci_dispatch(v, table, flags, &data); if (r < 0) return r; if (data.swap != UINT64_MAX) { if (data.limit == UINT64_MAX) json_log(v, flags|LOG_WARNING, 0, "swap limit without memory limit is not supported, ignoring."); else if (data.swap < data.limit) json_log(v, flags|LOG_WARNING, 0, "swap limit is below memory limit, ignoring."); else { r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "MemorySwapMax", "t", data.swap - data.limit); if (r < 0) return bus_log_create_error(r); } } if (data.limit != UINT64_MAX) { r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "MemoryMax", "t", data.limit); if (r < 0) return bus_log_create_error(r); } if (data.reservation != UINT64_MAX) { r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "MemoryLow", "t", data.reservation); if (r < 0) return bus_log_create_error(r); } return 0; } struct cpu_data { uint64_t shares; uint64_t quota; uint64_t period; CPUSet cpu_set; }; static int oci_cgroup_cpu_shares(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uint64_t *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(v); if (k < CGROUP_CPU_SHARES_MIN || k > CGROUP_CPU_SHARES_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "shares value out of range."); *u = (uint64_t) k; return 0; } static int oci_cgroup_cpu_quota(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uint64_t *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(v); if (k <= 0 || k >= UINT64_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "period/quota value out of range."); *u = (uint64_t) k; return 0; } static int oci_cgroup_cpu_cpus(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { struct cpu_data *data = ASSERT_PTR(userdata); CPUSet set; const char *n; int r; assert_se(n = json_variant_string(v)); r = parse_cpu_set(n, &set); if (r < 0) return json_log(v, flags, r, "Failed to parse CPU set specification: %s", n); cpu_set_reset(&data->cpu_set); data->cpu_set = set; return 0; } static int oci_cgroup_cpu(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "shares", JSON_VARIANT_UNSIGNED, oci_cgroup_cpu_shares, offsetof(struct cpu_data, shares), 0 }, { "quota", JSON_VARIANT_UNSIGNED, oci_cgroup_cpu_quota, offsetof(struct cpu_data, quota), 0 }, { "period", JSON_VARIANT_UNSIGNED, oci_cgroup_cpu_quota, offsetof(struct cpu_data, period), 0 }, { "realtimeRuntime", JSON_VARIANT_UNSIGNED, oci_unsupported, 0, 0 }, { "realtimePeriod", JSON_VARIANT_UNSIGNED, oci_unsupported, 0, 0 }, { "cpus", JSON_VARIANT_STRING, oci_cgroup_cpu_cpus, 0, 0 }, { "mems", JSON_VARIANT_STRING, oci_unsupported, 0, 0 }, {} }; struct cpu_data data = { .shares = UINT64_MAX, .quota = UINT64_MAX, .period = UINT64_MAX, }; Settings *s = ASSERT_PTR(userdata); int r; r = oci_dispatch(v, table, flags, &data); if (r < 0) { cpu_set_reset(&data.cpu_set); return r; } cpu_set_reset(&s->cpu_set); s->cpu_set = data.cpu_set; if (data.shares != UINT64_MAX) { r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "CPUShares", "t", data.shares); if (r < 0) return bus_log_create_error(r); } if (data.quota != UINT64_MAX && data.period != UINT64_MAX) { r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "CPUQuotaPerSecUSec", "t", (uint64_t) (data.quota * USEC_PER_SEC / data.period)); if (r < 0) return bus_log_create_error(r); } else if ((data.quota != UINT64_MAX) != (data.period != UINT64_MAX)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "CPU quota and period not used together."); return 0; } static int oci_cgroup_block_io_weight(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); uint64_t k; int r; k = json_variant_unsigned(v); if (k < CGROUP_BLKIO_WEIGHT_MIN || k > CGROUP_BLKIO_WEIGHT_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Block I/O weight out of range."); r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "BlockIOWeight", "t", (uint64_t) k); if (r < 0) return bus_log_create_error(r); return 0; } static int oci_cgroup_block_io_weight_device(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { struct device_data { unsigned major; unsigned minor; uint64_t weight; } data = { .major = UINT_MAX, .minor = UINT_MAX, .weight = UINT64_MAX, }; static const JsonDispatch table[] = { { "major", JSON_VARIANT_UNSIGNED, oci_device_major, offsetof(struct device_data, major), JSON_MANDATORY }, { "minor", JSON_VARIANT_UNSIGNED, oci_device_minor, offsetof(struct device_data, minor), JSON_MANDATORY }, { "weight", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(struct device_data, weight), 0 }, { "leafWeight", JSON_VARIANT_INTEGER, oci_unsupported, 0, JSON_PERMISSIVE }, {} }; _cleanup_free_ char *path = NULL; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (data.weight == UINT64_MAX) continue; if (data.weight < CGROUP_BLKIO_WEIGHT_MIN || data.weight > CGROUP_BLKIO_WEIGHT_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Block I/O device weight out of range."); r = device_path_make_major_minor(S_IFBLK, makedev(data.major, data.minor), &path); if (r < 0) return json_log(v, flags, r, "Failed to build device path: %m"); r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "BlockIODeviceWeight", "a(st)", 1, path, (uint64_t) data.weight); if (r < 0) return bus_log_create_error(r); } return 0; } static int oci_cgroup_block_io_throttle(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); const char *pname; JsonVariant *e; int r; pname = streq(name, "throttleReadBpsDevice") ? "IOReadBandwidthMax" : streq(name, "throttleWriteBpsDevice") ? "IOWriteBandwidthMax" : streq(name, "throttleReadIOPSDevice") ? "IOReadIOPSMax" : "IOWriteIOPSMax"; JSON_VARIANT_ARRAY_FOREACH(e, v) { struct device_data { unsigned major; unsigned minor; uint64_t rate; } data = { .major = UINT_MAX, .minor = UINT_MAX, }; static const JsonDispatch table[] = { { "major", JSON_VARIANT_UNSIGNED, oci_device_major, offsetof(struct device_data, major), JSON_MANDATORY }, { "minor", JSON_VARIANT_UNSIGNED, oci_device_minor, offsetof(struct device_data, minor), JSON_MANDATORY }, { "rate", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(struct device_data, rate), JSON_MANDATORY }, {} }; _cleanup_free_ char *path = NULL; r = oci_dispatch(e, table, flags, &data); if (r < 0) return r; if (data.rate >= UINT64_MAX) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Block I/O device rate out of range."); r = device_path_make_major_minor(S_IFBLK, makedev(data.major, data.minor), &path); if (r < 0) return json_log(v, flags, r, "Failed to build device path: %m"); r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", pname, "a(st)", 1, path, (uint64_t) data.rate); if (r < 0) return bus_log_create_error(r); } return 0; } static int oci_cgroup_block_io(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "weight", JSON_VARIANT_UNSIGNED, oci_cgroup_block_io_weight, 0, 0 }, { "leafWeight", JSON_VARIANT_UNSIGNED, oci_unsupported, 0, JSON_PERMISSIVE }, { "weightDevice", JSON_VARIANT_ARRAY, oci_cgroup_block_io_weight_device, 0, 0 }, { "throttleReadBpsDevice", JSON_VARIANT_ARRAY, oci_cgroup_block_io_throttle, 0, 0 }, { "throttleWriteBpsDevice", JSON_VARIANT_ARRAY, oci_cgroup_block_io_throttle, 0, 0 }, { "throttleReadIOPSDevice", JSON_VARIANT_ARRAY, oci_cgroup_block_io_throttle, 0, 0 }, { "throttleWriteIOPSDevice", JSON_VARIANT_ARRAY, oci_cgroup_block_io_throttle, 0, 0 }, {} }; return oci_dispatch(v, table, flags, userdata); } static int oci_cgroup_pids(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "limit", JSON_VARIANT_NUMBER, json_dispatch_variant, 0, JSON_MANDATORY }, {} }; _cleanup_(json_variant_unrefp) JsonVariant *k = NULL; Settings *s = ASSERT_PTR(userdata); uint64_t m; int r; r = oci_dispatch(v, table, flags, &k); if (r < 0) return r; if (json_variant_is_negative(k)) m = UINT64_MAX; else { if (!json_variant_is_unsigned(k)) return json_log(k, flags, SYNTHETIC_ERRNO(EINVAL), "pids limit not unsigned integer, refusing."); m = (uint64_t) json_variant_unsigned(k); if ((uint64_t) m != json_variant_unsigned(k)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "pids limit out of range, refusing."); } r = settings_allocate_properties(s); if (r < 0) return r; r = sd_bus_message_append(s->properties, "(sv)", "TasksMax", "t", m); if (r < 0) return bus_log_create_error(r); return 0; } static int oci_resources(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "devices", JSON_VARIANT_ARRAY, oci_cgroup_devices, 0, 0 }, { "memory", JSON_VARIANT_OBJECT, oci_cgroup_memory, 0, 0 }, { "cpu", JSON_VARIANT_OBJECT, oci_cgroup_cpu, 0, 0 }, { "blockIO", JSON_VARIANT_OBJECT, oci_cgroup_block_io, 0, 0 }, { "hugepageLimits", JSON_VARIANT_ARRAY, oci_unsupported, 0, 0 }, { "network", JSON_VARIANT_OBJECT, oci_unsupported, 0, 0 }, { "pids", JSON_VARIANT_OBJECT, oci_cgroup_pids, 0, 0 }, { "rdma", JSON_VARIANT_OBJECT, oci_unsupported, 0, 0 }, {} }; return oci_dispatch(v, table, flags, userdata); } static bool sysctl_key_valid(const char *s) { bool dot = true; /* Note that we are a bit stricter here than in systemd-sysctl, as that inherited semantics from the old sysctl * tool, which were really weird (as it swaps / and . in both ways) */ if (isempty(s)) return false; for (; *s; s++) { if (*s <= ' ' || *s >= 127) return false; if (*s == '/') return false; if (*s == '.') { if (dot) /* Don't allow two dots next to each other (or at the beginning) */ return false; dot = true; } else dot = false; } if (dot) /* don't allow a dot at the end */ return false; return true; } static int oci_sysctl(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *w; const char *k; int r; JSON_VARIANT_OBJECT_FOREACH(k, w, v) { const char *m; if (!json_variant_is_string(w)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "sysctl parameter is not a string, refusing."); assert_se(m = json_variant_string(w)); if (!sysctl_key_valid(k)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "sysctl key invalid, refusing: %s", k); r = strv_extend_strv(&s->sysctl, STRV_MAKE(k, m), false); if (r < 0) return log_oom(); } return 0; } #if HAVE_SECCOMP static int oci_seccomp_action_from_string(const char *name, uint32_t *ret) { static const struct { const char *name; uint32_t action; } table[] = { { "SCMP_ACT_ALLOW", SCMP_ACT_ALLOW }, { "SCMP_ACT_ERRNO", SCMP_ACT_ERRNO(EPERM) }, /* the OCI spec doesn't document the error, but it appears EPERM is supposed to be used */ { "SCMP_ACT_KILL", SCMP_ACT_KILL }, #ifdef SCMP_ACT_KILL_PROCESS { "SCMP_ACT_KILL_PROCESS", SCMP_ACT_KILL_PROCESS }, #endif #ifdef SCMP_ACT_KILL_THREAD { "SCMP_ACT_KILL_THREAD", SCMP_ACT_KILL_THREAD }, #endif #ifdef SCMP_ACT_LOG { "SCMP_ACT_LOG", SCMP_ACT_LOG }, #endif { "SCMP_ACT_TRAP", SCMP_ACT_TRAP }, /* We don't support SCMP_ACT_TRACE because that requires a tracer, and that doesn't really make sense * here */ }; size_t i; for (i = 0; i < ELEMENTSOF(table); i++) if (streq_ptr(name, table[i].name)) { *ret = table[i].action; return 0; } return -EINVAL; } static int oci_seccomp_arch_from_string(const char *name, uint32_t *ret) { static const struct { const char *name; uint32_t arch; } table[] = { { "SCMP_ARCH_AARCH64", SCMP_ARCH_AARCH64 }, { "SCMP_ARCH_ARM", SCMP_ARCH_ARM }, #ifdef SCMP_ARCH_LOONGARCH64 { "SCMP_ARCH_LOONGARCH64", SCMP_ARCH_LOONGARCH64 }, #endif { "SCMP_ARCH_MIPS", SCMP_ARCH_MIPS }, { "SCMP_ARCH_MIPS64", SCMP_ARCH_MIPS64 }, { "SCMP_ARCH_MIPS64N32", SCMP_ARCH_MIPS64N32 }, { "SCMP_ARCH_MIPSEL", SCMP_ARCH_MIPSEL }, { "SCMP_ARCH_MIPSEL64", SCMP_ARCH_MIPSEL64 }, { "SCMP_ARCH_MIPSEL64N32", SCMP_ARCH_MIPSEL64N32 }, { "SCMP_ARCH_NATIVE", SCMP_ARCH_NATIVE }, #ifdef SCMP_ARCH_PARISC { "SCMP_ARCH_PARISC", SCMP_ARCH_PARISC }, #endif #ifdef SCMP_ARCH_PARISC64 { "SCMP_ARCH_PARISC64", SCMP_ARCH_PARISC64 }, #endif { "SCMP_ARCH_PPC", SCMP_ARCH_PPC }, { "SCMP_ARCH_PPC64", SCMP_ARCH_PPC64 }, { "SCMP_ARCH_PPC64LE", SCMP_ARCH_PPC64LE }, #ifdef SCMP_ARCH_RISCV64 { "SCMP_ARCH_RISCV64", SCMP_ARCH_RISCV64 }, #endif { "SCMP_ARCH_S390", SCMP_ARCH_S390 }, { "SCMP_ARCH_S390X", SCMP_ARCH_S390X }, { "SCMP_ARCH_X32", SCMP_ARCH_X32 }, { "SCMP_ARCH_X86", SCMP_ARCH_X86 }, { "SCMP_ARCH_X86_64", SCMP_ARCH_X86_64 }, }; size_t i; for (i = 0; i < ELEMENTSOF(table); i++) if (streq_ptr(table[i].name, name)) { *ret = table[i].arch; return 0; } return -EINVAL; } static int oci_seccomp_compare_from_string(const char *name, enum scmp_compare *ret) { static const struct { const char *name; enum scmp_compare op; } table[] = { { "SCMP_CMP_NE", SCMP_CMP_NE }, { "SCMP_CMP_LT", SCMP_CMP_LT }, { "SCMP_CMP_LE", SCMP_CMP_LE }, { "SCMP_CMP_EQ", SCMP_CMP_EQ }, { "SCMP_CMP_GE", SCMP_CMP_GE }, { "SCMP_CMP_GT", SCMP_CMP_GT }, { "SCMP_CMP_MASKED_EQ", SCMP_CMP_MASKED_EQ }, }; size_t i; for (i = 0; i < ELEMENTSOF(table); i++) if (streq_ptr(table[i].name, name)) { *ret = table[i].op; return 0; } return -EINVAL; } static int oci_seccomp_archs(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { scmp_filter_ctx *sc = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { uint32_t a; if (!json_variant_is_string(e)) return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "Architecture entry is not a string"); r = oci_seccomp_arch_from_string(json_variant_string(e), &a); if (r < 0) return json_log(e, flags, r, "Unknown architecture: %s", json_variant_string(e)); r = seccomp_arch_add(sc, a); if (r == -EEXIST) continue; if (r < 0) return json_log(e, flags, r, "Failed to add architecture to seccomp filter: %m"); } return 0; } struct syscall_rule { char **names; uint32_t action; struct scmp_arg_cmp *arguments; size_t n_arguments; }; static void syscall_rule_done(struct syscall_rule *rule) { assert(rule); strv_free(rule->names); free(rule->arguments); }; static int oci_seccomp_action(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { uint32_t *action = ASSERT_PTR(userdata); int r; r = oci_seccomp_action_from_string(json_variant_string(v), action); if (r < 0) return json_log(v, flags, r, "Unknown system call action '%s': %m", json_variant_string(v)); return 0; } static int oci_seccomp_op(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { enum scmp_compare *op = ASSERT_PTR(userdata); int r; r = oci_seccomp_compare_from_string(json_variant_string(v), op); if (r < 0) return json_log(v, flags, r, "Unknown seccomp operator '%s': %m", json_variant_string(v)); return 0; } static int oci_seccomp_args(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { struct syscall_rule *rule = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { static const struct JsonDispatch table[] = { { "index", JSON_VARIANT_UNSIGNED, json_dispatch_uint32, offsetof(struct scmp_arg_cmp, arg), JSON_MANDATORY }, { "value", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(struct scmp_arg_cmp, datum_a), JSON_MANDATORY }, { "valueTwo", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(struct scmp_arg_cmp, datum_b), 0 }, { "op", JSON_VARIANT_STRING, oci_seccomp_op, offsetof(struct scmp_arg_cmp, op), JSON_MANDATORY }, {}, }; struct scmp_arg_cmp *a, *p; int expected; a = reallocarray(rule->arguments, rule->n_arguments + 1, sizeof(struct syscall_rule)); if (!a) return log_oom(); rule->arguments = a; p = rule->arguments + rule->n_arguments; *p = (struct scmp_arg_cmp) { .arg = 0, .datum_a = 0, .datum_b = 0, .op = 0, }; r = oci_dispatch(e, table, flags, p); if (r < 0) return r; expected = p->op == SCMP_CMP_MASKED_EQ ? 4 : 3; if (r != expected) json_log(e, flags|JSON_WARNING, 0, "Wrong number of system call arguments for JSON data, ignoring."); /* Note that we are a bit sloppy here and do not insist that SCMP_CMP_MASKED_EQ gets two datum values, * and the other only one. That's because buildah for example by default calls things with * SCMP_CMP_MASKED_EQ but only one argument. We use 0 when the value is not specified. */ rule->n_arguments++; } return 0; } static int oci_seccomp_syscalls(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { scmp_filter_ctx *sc = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { static const JsonDispatch table[] = { { "names", JSON_VARIANT_ARRAY, json_dispatch_strv, offsetof(struct syscall_rule, names), JSON_MANDATORY }, { "action", JSON_VARIANT_STRING, oci_seccomp_action, offsetof(struct syscall_rule, action), JSON_MANDATORY }, { "args", JSON_VARIANT_ARRAY, oci_seccomp_args, 0, 0 }, {} }; _cleanup_(syscall_rule_done) struct syscall_rule rule = { .action = UINT32_MAX, }; r = oci_dispatch(e, table, flags, &rule); if (r < 0) return r; if (strv_isempty(rule.names)) { json_log(e, flags, 0, "System call name list is empty."); return -EINVAL; } STRV_FOREACH(i, rule.names) { int nr; nr = seccomp_syscall_resolve_name(*i); if (nr == __NR_SCMP_ERROR) { log_debug("Unknown syscall %s, skipping.", *i); continue; } r = seccomp_rule_add_array(sc, rule.action, nr, rule.n_arguments, rule.arguments); if (r < 0) return r; } } return 0; } #endif static int oci_seccomp(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { #if HAVE_SECCOMP static const JsonDispatch table[] = { { "defaultAction", JSON_VARIANT_STRING, NULL, 0, JSON_MANDATORY }, { "architectures", JSON_VARIANT_ARRAY, oci_seccomp_archs, 0, 0 }, { "syscalls", JSON_VARIANT_ARRAY, oci_seccomp_syscalls, 0, 0 }, {} }; _cleanup_(seccomp_releasep) scmp_filter_ctx sc = NULL; Settings *s = ASSERT_PTR(userdata); JsonVariant *def; uint32_t d; int r; def = json_variant_by_key(v, "defaultAction"); if (!def) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "defaultAction element missing."); if (!json_variant_is_string(def)) return json_log(def, flags, SYNTHETIC_ERRNO(EINVAL), "defaultAction is not a string."); r = oci_seccomp_action_from_string(json_variant_string(def), &d); if (r < 0) return json_log(def, flags, r, "Unknown default action: %s", json_variant_string(def)); sc = seccomp_init(d); if (!sc) return json_log(v, flags, SYNTHETIC_ERRNO(ENOMEM), "Couldn't allocate seccomp object."); r = oci_dispatch(v, table, flags, sc); if (r < 0) return r; seccomp_release(s->seccomp); s->seccomp = TAKE_PTR(sc); return 0; #else return json_log(v, flags, SYNTHETIC_ERRNO(EOPNOTSUPP), "libseccomp support not enabled, can't parse seccomp object."); #endif } static int oci_rootfs_propagation(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { const char *s; s = json_variant_string(v); if (streq(s, "shared")) return 0; json_log(v, flags|JSON_DEBUG, 0, "Ignoring rootfsPropagation setting '%s'.", s); return 0; } static int oci_masked_paths(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; JSON_VARIANT_ARRAY_FOREACH(e, v) { _cleanup_free_ char *destination = NULL; CustomMount *m; const char *p; if (!json_variant_is_string(e)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Path is not a string, refusing."); assert_se(p = json_variant_string(e)); if (!path_is_absolute(p)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Path is not absolute, refusing: %s", p); if (oci_exclude_mount(p)) continue; destination = strdup(p); if (!destination) return log_oom(); m = custom_mount_add(&s->custom_mounts, &s->n_custom_mounts, CUSTOM_MOUNT_INACCESSIBLE); if (!m) return log_oom(); m->destination = TAKE_PTR(destination); /* The spec doesn't say this, but apparently pre-existing implementations are lenient towards * non-existing paths to mask. Let's hence be too. */ m->graceful = true; } return 0; } static int oci_readonly_paths(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; JSON_VARIANT_ARRAY_FOREACH(e, v) { _cleanup_free_ char *source = NULL, *destination = NULL; CustomMount *m; const char *p; if (!json_variant_is_string(e)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Path is not a string, refusing."); assert_se(p = json_variant_string(e)); if (!path_is_absolute(p)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Path is not absolute, refusing: %s", p); if (oci_exclude_mount(p)) continue; source = strjoin("+", p); if (!source) return log_oom(); destination = strdup(p); if (!destination) return log_oom(); m = custom_mount_add(&s->custom_mounts, &s->n_custom_mounts, CUSTOM_MOUNT_BIND); if (!m) return log_oom(); m->source = TAKE_PTR(source); m->destination = TAKE_PTR(destination); m->read_only = true; } return 0; } static int oci_linux(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "namespaces", JSON_VARIANT_ARRAY, oci_namespaces, 0, 0 }, { "uidMappings", JSON_VARIANT_ARRAY, oci_uid_gid_mappings, 0, 0 }, { "gidMappings", JSON_VARIANT_ARRAY, oci_uid_gid_mappings, 0, 0 }, { "devices", JSON_VARIANT_ARRAY, oci_devices, 0, 0 }, { "cgroupsPath", JSON_VARIANT_STRING, oci_cgroups_path, 0, 0 }, { "resources", JSON_VARIANT_OBJECT, oci_resources, 0, 0 }, { "intelRdt", JSON_VARIANT_OBJECT, oci_unsupported, 0, JSON_PERMISSIVE }, { "sysctl", JSON_VARIANT_OBJECT, oci_sysctl, 0, 0 }, { "seccomp", JSON_VARIANT_OBJECT, oci_seccomp, 0, 0 }, { "rootfsPropagation", JSON_VARIANT_STRING, oci_rootfs_propagation, 0, 0 }, { "maskedPaths", JSON_VARIANT_ARRAY, oci_masked_paths, 0, 0 }, { "readonlyPaths", JSON_VARIANT_ARRAY, oci_readonly_paths, 0, 0 }, { "mountLabel", JSON_VARIANT_STRING, oci_unsupported, 0, JSON_PERMISSIVE }, {} }; return oci_dispatch(v, table, flags, userdata); } static int oci_hook_timeout(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { usec_t *u = ASSERT_PTR(userdata); uint64_t k; k = json_variant_unsigned(v); if (k == 0 || k > (UINT64_MAX-1)/USEC_PER_SEC) return json_log(v, flags, SYNTHETIC_ERRNO(ERANGE), "Hook timeout value out of range."); *u = k * USEC_PER_SEC; return 0; } static int oci_hooks_array(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { Settings *s = ASSERT_PTR(userdata); JsonVariant *e; int r; JSON_VARIANT_ARRAY_FOREACH(e, v) { static const JsonDispatch table[] = { { "path", JSON_VARIANT_STRING, oci_absolute_path, offsetof(OciHook, path), JSON_MANDATORY }, { "args", JSON_VARIANT_ARRAY, oci_args, offsetof(OciHook, args), 0 }, { "env", JSON_VARIANT_ARRAY, oci_env, offsetof(OciHook, env), 0 }, { "timeout", JSON_VARIANT_UNSIGNED, oci_hook_timeout, offsetof(OciHook, timeout), 0 }, {} }; OciHook *a, **array, *new_item; size_t *n_array; if (streq(name, "prestart")) { array = &s->oci_hooks_prestart; n_array = &s->n_oci_hooks_prestart; } else if (streq(name, "poststart")) { array = &s->oci_hooks_poststart; n_array = &s->n_oci_hooks_poststart; } else { assert(streq(name, "poststop")); array = &s->oci_hooks_poststop; n_array = &s->n_oci_hooks_poststop; } a = reallocarray(*array, *n_array + 1, sizeof(OciHook)); if (!a) return log_oom(); *array = a; new_item = a + *n_array; *new_item = (OciHook) { .timeout = USEC_INFINITY, }; r = oci_dispatch(e, table, flags, new_item); if (r < 0) { free(new_item->path); strv_free(new_item->args); strv_free(new_item->env); return r; } (*n_array) ++; } return 0; } static int oci_hooks(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { static const JsonDispatch table[] = { { "prestart", JSON_VARIANT_ARRAY, oci_hooks_array, 0, 0 }, { "poststart", JSON_VARIANT_ARRAY, oci_hooks_array, 0, 0 }, { "poststop", JSON_VARIANT_ARRAY, oci_hooks_array, 0, 0 }, {} }; return oci_dispatch(v, table, flags, userdata); } static int oci_annotations(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { JsonVariant *w; const char *k; JSON_VARIANT_OBJECT_FOREACH(k, w, v) { if (isempty(k)) return json_log(v, flags, SYNTHETIC_ERRNO(EINVAL), "Annotation with empty key, refusing."); if (!json_variant_is_string(w)) return json_log(w, flags, SYNTHETIC_ERRNO(EINVAL), "Annotation has non-string value, refusing."); json_log(w, flags|JSON_DEBUG, 0, "Ignoring annotation '%s' with value '%s'.", k, json_variant_string(w)); } return 0; } int oci_load(FILE *f, const char *bundle, Settings **ret) { static const JsonDispatch table[] = { { "ociVersion", JSON_VARIANT_STRING, NULL, 0, JSON_MANDATORY }, { "process", JSON_VARIANT_OBJECT, oci_process, 0, 0 }, { "root", JSON_VARIANT_OBJECT, oci_root, 0, 0 }, { "hostname", JSON_VARIANT_STRING, oci_hostname, 0, 0 }, { "mounts", JSON_VARIANT_ARRAY, oci_mounts, 0, 0 }, { "linux", JSON_VARIANT_OBJECT, oci_linux, 0, 0 }, { "hooks", JSON_VARIANT_OBJECT, oci_hooks, 0, 0 }, { "annotations", JSON_VARIANT_OBJECT, oci_annotations, 0, 0 }, {} }; _cleanup_(json_variant_unrefp) JsonVariant *oci = NULL; _cleanup_(settings_freep) Settings *s = NULL; unsigned line = 0, column = 0; JsonVariant *v; const char *path; int r; assert_se(bundle); path = strjoina(bundle, "/config.json"); r = json_parse_file(f, path, 0, &oci, &line, &column); if (r < 0) { if (line != 0 && column != 0) return log_error_errno(r, "Failed to parse '%s' at %u:%u: %m", path, line, column); else return log_error_errno(r, "Failed to parse '%s': %m", path); } v = json_variant_by_key(oci, "ociVersion"); if (!v) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "JSON file '%s' is not an OCI bundle configuration file. Refusing.", path); if (!streq_ptr(json_variant_string(v), "1.0.0")) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "OCI bundle version not supported: %s", strna(json_variant_string(v))); // { // _cleanup_free_ char *formatted = NULL; // assert_se(json_variant_format(oci, JSON_FORMAT_PRETTY|JSON_FORMAT_COLOR, &formatted) >= 0); // fputs(formatted, stdout); // } s = settings_new(); if (!s) return log_oom(); s->start_mode = START_PID1; s->resolv_conf = RESOLV_CONF_OFF; s->link_journal = LINK_NO; s->timezone = TIMEZONE_OFF; s->bundle = strdup(bundle); if (!s->bundle) return log_oom(); r = oci_dispatch(oci, table, 0, s); if (r < 0) return r; if (s->properties) { r = sd_bus_message_seal(s->properties, 0, 0); if (r < 0) return log_error_errno(r, "Cannot seal properties bus message: %m"); } *ret = TAKE_PTR(s); return 0; }